The 23-year-old attacking midfielder has been a key member of Mourinho’s first team, who scored four goals in 15 Premier League games this season and also helped the club win the Europa League in 2013.

“I am so happy because I love playing for Chelsea and living in England,” the Brazilian told the club’s official website. “I have enjoyed playing here for two years, and now I have five more, so I am very happy.”

Oscar has scored 27 goals in 126 appearances for Chelsea since joining the Blues from Internacional in 2012.

Chelsea remain unbeaten and leading the Premier League table after 11 games with 29 points.

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